激光焊接核电用CLF-1钢的组织与性能  

Microstructures and properties of CLF-1 steel for laser welding in nuclear power plant

作　　者：徐国建[1] 井志成 张国瑜 刘祥宇 廖洪彬[3] XU Guo-jian;JING Zhi-cheng;ZHANG Guo-yu;LIU Xiang-yu;LIAO Hong-bin(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;Liaoning Additive Manufacturing Industry Technology Research Institute Co.Ltd. , Shenyang 110870, China;Southwest Institute of Physics for Nuclear Industry, Chengdu 610041, China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]辽宁增材制造产业技术研究院有限公司,沈阳110870 [3]核工业西南物理研究院,成都610041

出　　处：《沈阳工业大学学报》2022年第3期277-282,共6页Journal of Shenyang University of Technology

基　　金：广东省重点领域研发计划项目(2018B090905003).

摘　　要：为了提高CLF-1钢的焊接质量,采用激光焊接技术获得了成形良好且无冶金缺陷的对接焊缝,研究了焊态与PWHT态下的焊缝组织和力学性能.结果表明:焊缝组织均由大量马氏体及少量δ-铁素体组成;焊态下有微量针状碳化物析出,PWHT态下析出的点状碳化物分布在δ-铁素体边界与板条马氏体内部;与焊态相比,PWHT态焊缝抗拉强度降低,而屈服强度、伸长率和断面收缩率均提高,维氏硬度均值降低;拉伸试样均断裂于远离焊接接头的母材处;由于δ-铁素体的存在,焊态和PWHT态焊缝冲击功均低于母材.In order to improve the welding quality of CLF-1 steel,well-formed butt welds with no metallurgical defects were obtained by a laser welding technology.The microstructures and mechanical properties of welds at both as-welded and PWHT states were studied.The results show that the weld microstructures at both states are composed of a large amount of martensite and a small amount ofδ-ferrite.At the as-welded state,a small amount of needle-like carbides precipitate,while the dot-like carbides precipitate at the PWHT state and distribute at the boundaries ofδ-ferrite and inside the lath martensite.Compared with the as-welded state,the tensile strength of welds at the PWHT state decreases,while the yield strength,elongation and area reduction all increase,and the average Vickers hardness decreases.The tensile specimens are fractured at the base metal far away from welded joints.Due to the existence ofδ-ferrite,the impact energies of welds at the as-welded and PWHT states are all lower than that of base metal.

关 键 词：激光焊接 CLF-1钢 核聚变 热处理 Δ-铁素体 析出相 显微组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]